Covariant formalism; Nucleon-nucleon; Partial sums; Parton distributions; Parton scattering; Poincare; Sum rule; Engineering (miscellaneous); Physics and Astronomy (miscellaneous)
Abstract :
[en] In this paper, we address double parton scattering (DPS) in pA collisions. Within the Light-Front approach, we formally derive the two contributions to the nuclear double parton distribution (DPD), namely: DPS1, involving two partons from the same nucleon, and DPS2, where the two partons belong to different parent nucleons. We then generalize the sum rule for hadron DPDs to the nuclear case and analytically show how all contributions combine to give the expected results. In addition partial sum rules for the DPDs related to DPS1 and DPS2 mechanisms are discussed for the first time. The deuteron system is considered for the first calculation of the nuclear DPD by using a realistic wave function obtained from the very refined nucleon-nucleon AV18 potential, embedded in a rigorous Poincaré covariant formalism. Results are used to test sum rules and properly verify that DPS1 contribution compares with the DPS2 one, although smaller. We also introduce EMC-like ratios involving nuclear and free DPDs to address the potential role of DPS in understanding in depth the EMC effect.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Ceccopieri, Federico ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Interactions fondamentales en physique et astrophysique (IFPA)
Fornetti, Filippo ; Dipartimento di Fisica e Geologia, Università degli Studi di Perugia and INFN Sezione di Perugia, Perugia, Italy
Pace, Emanuele ; Università di Roma Tor Vergata, Rome, Italy
Rinaldi, Matteo; Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, Perugia, Italy
Salmè, Giovanni ; Istituto Nazionale di Fisica Nucleare, Sezione di Roma, Rome, Italy
Iles, Nicholas; Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, Perugia, Italy
Language :
English
Title :
Theoretical insights on nuclear double parton distributions
H2020 - 824093 - STRONG-2020 - The strong interaction at the frontier of knowledge: fundamental research and applications
Funders :
EU - European Union
Funding text :
M. Rinaldi thanks for the financial support received under the STRONG-2020 project of the European Union\u2019s Horizon 2020 research and innovation programme: Fund no 824093.
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